Etymology
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interrogate (v.)

late 15c., a back-formation from interrogation or else from Latin interrogatus, past participle of interrogare "to ask, question, inquire; interrogate judicially, cross-examine," from inter "between" (see inter-) + rogare "to ask, to question," apparently a figurative use of a PIE verb meaning literally "to stretch out (the hand)," from root *reg- "move in a straight line." The Old French word was interroger (14c.) which yielded English interroge (late 15c.), now obsolete. Related: Interrogated; interrogating.

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Definitions of interrogate

interrogate (v.)
transmit (a signal) for setting off an appropriate response, as in telecommunication;
interrogate (v.)
pose a series of questions to;
Synonyms: question
From wordnet.princeton.edu